I don't have any idea if "John" had a jaw bone infection in the first place, or whether it was cured with sodium chlorite, or even if "John" is an actual person, or if this "John" is a stooge of the scammers, and writes up testimonials to try and flog the product to those gullible enough to take anonymous internet testimony as reliable evidence.
Same goes for "the single Mum with MRSA", could be anybody, could be nobody.
Anonymous internet testimonies are useless in terms of being credible and verifiable evidence, and should be treated as such by any person that can think objectively and critically.
So does this chemical work to cure anything at all? Its a known antiseptic, so it may have uses in that area, but anyone who has studied chemistry and biology, will know that what works outside the body, does not work the same within the body. What is safe outside the body, may be very toxic within the body.
Medical researchers will look at a chemical or product, if there is some evidence to show that it works in a way that benefits rather than harms, and are obviously not interested in testing sodium chlorite. Perhaps if you are so keen on this chemical as some sort of medication, you should fund some testing yourself, or look for someone with money to fund it.
Until peer reviewed, repeatable and verifiable studies are done, there will be no credible evidence of the efficacy of sodium chlorite. If JH is an indication of what happens to people who ingest this chemical on a regular basis, then its best avoided by anyone who cares about their mental health.